/**
 * Butterfly
 * @example
 *  page_description()
 *  cloudTags(source, minfontsize, maxfontsize, limit)
 */

'use strict'

const { stripHTML, escapeHTML, prettyUrls } = require('hexo-util')
const crypto = require('crypto')

hexo.extend.helper.register('page_description', function() {
    const { config, page } = this
    let description = page.description || page.content || page.title || config.description

    if (description) {
        description = escapeHTML(stripHTML(description).substring(0, 150)
            .trim()
        ).replace(/\n/g, ' ')
        return description
    }
})

hexo.extend.helper.register('cloudTags', function(options = {}) {
    const env = this
    let { source, minfontsize, maxfontsize, limit, unit, orderby, order } = options
    unit = unit || 'px'

    let result = ''
    if (limit > 0) {
        source = source.limit(limit)
    }

    const sizes = []
    source.sort('length').forEach(tag => {
        const { length } = tag
        if (sizes.includes(length)) return
        sizes.push(length)
    })

    const length = sizes.length - 1
    source.sort(orderby, order).forEach(tag => {
        const ratio = length ? sizes.indexOf(tag.length) / length : 0
        const size = minfontsize + ((maxfontsize - minfontsize) * ratio)
        let style = `font-size: ${parseFloat(size.toFixed(2))}${unit};`
        const color = 'rgb(' + Math.floor(Math.random() * 201) + ', ' + Math.floor(Math.random() * 201) + ', ' + Math.floor(Math.random() * 201) + ')' // 0,0,0 -> 200,200,200
        style += ` color: ${color}`
        result += `<a href="${env.url_for(tag.path)}" style="${style}">${tag.name}</a>`
    })
    return result
})

hexo.extend.helper.register('urlNoIndex', function(url = null, trailingIndex = false, trailingHtml = false) {
    return prettyUrls(url || this.url, { trailing_index: trailingIndex, trailing_html: trailingHtml })
})

hexo.extend.helper.register('md5', function(path) {
    return crypto.createHash('md5').update(decodeURI(this.url_for(path))).digest('hex')
})

hexo.extend.helper.register('injectHtml', function(data) {
    let result = ''
    if (!data) return ''
    for (let i = 0; i < data.length; i++) {
        result += data[i]
    }
    return result
})

hexo.extend.helper.register('findArchivesTitle', function(page, menu, date) {
    if (page.year) {
        const dateStr = page.month ? `${page.year}-${page.month}` : `${page.year}`
        const dateFormat = page.month ? hexo.theme.config.aside.card_archives.format : 'YYYY'
        return date(dateStr, dateFormat)
    }

    const defaultTitle = this._p('page.archives')
    if (!menu) return defaultTitle

    const loop = (m) => {
        for (const key in m) {
            if (typeof m[key] === 'object') {
                loop(m[key])
            }

            if (/\/archives\//.test(m[key])) {
                return key
            }
        }
    }

    return loop(menu) || defaultTitle
})

hexo.extend.helper.register('isImgOrUrl', function(path) {
    const imgTestReg = /\.(png|jpe?g|gif|svg|webp)(\?.*)?$/
    if (path.indexOf('//') !== -1 || imgTestReg.test(path)) {
        return true
    }
    return false
})